Characterization of microstructural damage evolution of freeze-thawed shotcrete by an integrative micro-CT and nanoindentation statistical approach

被引：34
作者：
Liu, Mengxin [1 ,2 ]
Liu, Dongxu [2 ]
Qiao, Pizhong [1 ,3 ]
Sun, Lizhi [2 ]
机构：
[1] Shanghai Jiao Tong Univ, Sch Naval Architecture Ocean & Civil Engn, Shanghai, Peoples R China
[2] Univ Calif Irvine, Dept Civil & Environm Engn, Irvine, CA 92697 USA
[3] Washington State Univ, Dept Civil & Environm Engn, Pullman, WA 99164 USA
来源：
CEMENT & CONCRETE COMPOSITES | 2021年 / 117卷
基金：
中国国家自然科学基金;
关键词：
Shotcrete; Freezing and thawing; Microstructure; Nanoindentation; Micro-CT; INTERFACIAL TRANSITION ZONE; CHEMO-MECHANICAL PROPERTIES; RAY COMPUTED-TOMOGRAPHY; CONCRETE; AGGREGATE; PHASES; ITZ; MICROMECHANICS; COMPOSITES; CRACKING;
D O I：
10.1016/j.cemconcomp.2020.103909
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
It is crucial to investigate the evolution of microstructure to understand the deterioration mechanisms of shotcrete under cyclic freezing and thawing (F-T). In this study, nanoindentation and X-ray micro-CT techniques are integrated to characterize microstructural damage of shotcrete and its evolution due to F-T actions. An integrated statistical method of nanoindentation and micro-CT (NI-MCT) is developed with the Gaussian mixture deconvolution method to demonstrate the increase and correlation of the heterogeneous phase in cement paste and interfacial transition zones in the process of F-T cycles. The micromechanical property allows to segment the micro-CT images of cement paste into pores/cracks, porous phase, calcium silicate hydrate, and calcium hydroxide/unhydrated clinker. The integrated NI-MCT method can provide new knowledge on the evolution law of F-T-induced damage in cement paste and serve as an effective tool in characterizing and quantifying the damage and its evolution process for cement-based heterogeneous materials.
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页数：14
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